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I don't really think it will happen. The reason now that it is a 1-way ticket is because it is too expensive and takes too long to get there. If it were a return trip they would have to bring enough fuel for the return trip which itself costs bazillions, or find a way to make the fuel on Mars for the return trip.
What I think will happen is that before this trip launches, someone somewhere will come up with a much faster and much cheaper way to to get there, making the prospect of a 1 way trip pointless.
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